Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSPONTIAC1997GRAND PRIX GTP, 4D SEDANREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 7 (BODY CONTROL MODULE)DIAGNOSIS & REPAIRDTC B1802, COURTESY LIGHTS CIRCUIT (SHORT TO GROUND)TESTING
1997 Pontiac Grand Prix GTP, 4D Sedan
DTC B1802, Courtesy Lights Circuit (Short To Ground): Testing
1997 Pontiac Grand Prix GTP, 4D SedanSECTION Testing
WARNING: This page is about a different car, the 1997 Buick Regal and 1997 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
- If BCM diagnostic system check was performed, go to next step. If BCM diagnostic system check was not performed, go to BCM DIAGNOSTIC SYSTEM CHECK .
- Turn ignition off. Disconnect BCM 10-pin connector C3. Turn ignition on. Using test light, backprobe between battery voltage and BCM harness connector C3 terminal "F" (Orange wire). If test light illuminates, go to next step. If test light does not illuminate, go to step 4).
- Repair short to ground in Orange wire between BCM connector C3 and courtesy light(s). Go to step 6).
- Turn ignition off. Reinstall all components and connectors. Using scan tool, clear DTCs. Turn ignition off, then on. Check for DTCs. If DTC B1802 sets again, go to next step. If DTC B1802 does not set again, system is operating properly.
- Turn ignition off. Replace BCM. See REMOVAL & INSTALLATION . Reprogram BCM. See BCM PROGRAMMING. Go to next step.
- Turn ignition off. Reinstall all components and connectors. Turn ignition on. Using scan tool, clear DTCs. Perform BCM DIAGNOSTIC SYSTEM CHECK .
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.